Isolated mains voltage measurement

[max]

Hi friends,

How to measure isolated mains voltage without using isolating transformer?

regards

[oldvan]

Opto-isolator.

[chandra2sekhar2000]

Hello,
go though with the idea of the clamp meter.if u want to implement a circuit for that use,some windings like a coil,and use adc, microcontroller.

[microkid]

There are Analog opto isolators (single chip) available.

Another way is to convert the signal to digital and use regular opto isolators

MicroKid

[max]

microkid,  analog opto isolators are expensive, I need low cost solution.
any low cost example for the second option.

max

[microkid]

Any simple Voltage to frequency converter will do the job. (For example a 555 timer can be used as voltage to freq. converter)

[TomJackson69]

@ max

Your question maybe best answer by this question on the edaboard.com:

measure mains voltage isolated and
Re: What is the best way to measure main voltage with isolat

And here is link:
http://www.edaboard.com/thread158728.html?vm=r

Your question seems very simple but rather complex. It all depend on how you want to used for and your application.

Regards,

Tom